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. 2017 Oct 31;39(1):522–531. doi: 10.1002/hbm.23861

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Directed connectivity differences between auditory‐visual synesthetes (A) and nonsynesthetes (B), measured as isolated effective Coherence (iCoh) between parietal‐ (BA7), primary auditory (BA41), primary visual (V1), and secondary visual (V4) brain areas in the upper beta frequency band. Arrow thickness is weighted by absolute t values. (C) Directed connectivity values from the parietal lobe to left color processing area V4 for auditory‐visual synesthetes and nonsynesthetes (P < 0.05, FWE corrected). A = anterior; L = left hemisphere; R = right hemisphere; AVS = auditory‐visual synesthetes; E‐AVS = auditory‐visual synesthetes experiencing colors externally; NonS = nonsynesthetes. [Color figure can be viewed at http://wileyonlinelibrary.com]